I agree on the Sage argument. At this point in the game, to me, she seems like a person with a devil on her shoulder; a bit of a lost soul. I'm inclined to believe that she has her own set of skills, which have led her to become the President of the HOTs, for instance. At the very least, she's shown to be great at the interpersonal level, in addition to being capable of understanding how a fraternity needs to be run. Despite these strengths, she appears to lack self-awareness. She doesn't understand how some of those closest around her actually perceive her. She seems to confuse infatuation with love, not being able to leave a guy who's cheating on her. She can't see that Quinn runs the HOTs through manipulation and fear, nor the reality that Quinn is the unofficial leader of the fraternity. She doesn't realise that those feelings she feels for the MC, evident in her glances and smiles, are signs of a developing love.
The moments between them that seemed to resonate the most with me weren't the instances in which they were all over each other. They were the other ones. Whether or not the player takes the MC along the Sage route doesn't seem to impact how Sage really feels about him. On the Sage route, at the end of this update, I think it's Sarah who realises that friends with benefits don't kiss in the open and interact the way Sage and the MC do, hinting at the idea that there's something deeper there. I'd say that Sarah is right. If the player doesn't follow the Sage route, she alludes to the idea that the MC would be boyfriend material. Regardless of the path that the player takes, she reacts angrily at the MC for failing to previously reveal that his mother was dead, and shows genuine interest in his life to not appear insensitive again. For me, it's the fact that she believes that she has to know these details that is significant.
I've come to see from comments here that it's unlikely for the MC to be given happy finales with each of the main love interests. From a developer's perspective, this makes sense, as each developer is different. From a literary point of view, though, successful endings with all the love interests would make perfect sense. Each of the main females has a distinctive personality, which is a feature that many of these games lack.
Personally, Sage has actually grown on me. I'd love a good ending with her. In the next update, it'd be great to see an option for the MC to take her home for his birthday, where she'd meet his dad, which perhaps could give her some perspective on how people should treat each other and on what she's missing without him.